vm: Don't stack disk remove activities

Closes #391

circle/vm/models/instance.py

@@ -818,7 +818,9 @@ class Instance(AclBase, VirtualMachineDescModel, StatusModel, OperatedMixin,
         return acts
         return acts
 
 
     def get_merged_activities(self, user=None):
     def get_merged_activities(self, user=None):
-        whitelist = ("create_disk", "download_disk", "add_port", "remove_port")
+        whitelist = ("create_disk", "download_disk", "remove_disk",
+                     "add_port", "remove_port",
+                     "add_interface", "remove_interface")
         acts = self.get_activities(user)
         acts = self.get_activities(user)
         merged_acts = []
         merged_acts = []
         latest = None
         latest = None